Seamless tubes of titanium and titanium alloys-Technical delivery conditions
DIN 17860 specifies the technical delivery conditions for seamless titanium and titanium alloy tubes, including:
Mechanical properties
Chemical composition
Manufacturing methods
Dimensions and tolerances
Inspection and testing requirements
This standard is used in aerospace, chemical processing, power generation, and medical fields, where high corrosion resistance and strength-to-weight ratio are critical.
1. Applicable Materials
Covers a variety of commercially pure (CP) titanium grades and titanium alloys, such as:
Ti Grade 1 to 4 (unalloyed titanium)
Ti 6Al-4V (Grade 5)
Ti 3Al-2.5V (Grade 9)
Other specific alloys used in pressure-containing or structural applications
The exact alloys included may depend on the edition of the standard or referenced DIN EN ISO standards.
2. Dimensions and Tolerances
DIN 17860 defines:
Outside diameter (OD): Commonly 6 mm to 114.3 mm
Wall thickness (WT): Specified based on OD and application
Length:
Random length
Fixed length (on request)
Tolerances typically follow DIN 2391 or DIN ISO 286-1, unless otherwise specified.
Example OD tolerances (typical):
|
OD Range |
Tolerance (± mm) |
|
6–30 mm |
±0.15 mm |
|
30–50 mm |
±0.20 mm |
|
50–114.3 mm |
±0.30 mm |
Check the latest DIN or EN harmonized tables for precise tolerance values.
3. Mechanical Properties
Mechanical properties depend on grade and delivery condition (annealed, cold-worked, etc.). Typical requirements include:
|
Property |
Example (Ti Gr 2, annealed) |
|
Yield Strength |
≥ 275 MPa |
|
Tensile Strength |
≥ 345 MPa |
|
Elongation |
≥ 20% |
4. Testing & Inspection
Hydrostatic or air-under-water pressure test (for leaks)
Tensile test (room temperature)
Flattening test
Dimensional checks
Chemical composition analysis
Visual inspection (surface defects, straightness)
Optional tests (on agreement):
Eddy current or ultrasonic test
Grain size analysis
Microstructure examination
5. Marking and Certification
Tubes are typically marked with:
Grade and heat number
Manufacturer’s logo or name
Tube dimensions
Standard reference (e.g., DIN 17860)
A 3.1 certificate (EN 10204) is usually provided, including:
Chemical composition
Mechanical test results
Compliance declaration
Related Standards
DIN 17850-General technical terms for titanium products
DIN 17862-Forgings and forged bars of titanium alloys
DIN EN 10204- Inspection certificates
ASTM B338-U.S. standard for seamless titanium tubes
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